s-wave approximation for asymmetry in nonmesonic decay of finite hypernuclei

We review the anomaly induced effective action for dilaton coupled spinors and scalars in large-N and s-wave approximation. It may be applied to study the following fundamental problems: construction of quantum corrected black holes (BHs), inducing of primordial wormholes in the early Universe (this effect is confirmed) and the solution of initial singularity problem. The recently discovered anti-evaporation of multiple horizon BHs is discussed. The existence of such primordial BHs may be interpreted as SUSY manifestation. Quantum corrections to BHs thermodynamics may also be discussed within such scheme.

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Development of a Monte-Carlo Evaporation Code for Multiple-Fragment Emission

HNPS Proceedings ◽

10.12681/hnps.3353 ◽

2021 ◽

Vol 12 ◽

pp. 136

Author(s):

N. G. Nicolis

Keyword(s):

Monte Carlo ◽

Excitation Energy ◽

Excited States ◽

Compound Nucleus ◽

S Wave ◽

Intermediate Mass ◽

Wave Approximation ◽

Decay Widths ◽

Study Case ◽

Multiple Fragment

An extended Hauser-Feshbach approach has been employed in a multi-step Monte-Carlo evaporation code designed to study the de-excitation of highly excited compound nuclei. The code is intended to account for emission of light particles ($\gamma$, n, $^{1,2,3}$H, $^{3-6}$He) and intermediate mass fragments in their ground and excited states (particle-bound or unbound). As a study case, we consider the decay of the compound nucleus $^{120}$Te$^*$ at excitation energy 100, 200 and 300 MeV. First chance decay widths are compared with treatments based on the Weisskopf and the s-wave approximation. Preliminary calculations are compared with experimental isotopic yields of intermediate mass fragments emitted in E/A = 50 MeV $^{4}$He + $^{116,124}$Sn $\rightarrow$ $^{120,128}$Te$^*$ reactions.

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Vector meson-baryon octet interaction and resonances generated dynamically

International Journal of Modern Physics Conference Series ◽

10.1142/s2010194514602117 ◽

2014 ◽

Vol 29 ◽

pp. 1460211 ◽

Cited By ~ 1

Author(s):

B.-X. Sun ◽

Y.-W. Wang

Keyword(s):

Vector Meson ◽

Experimental Observation ◽

Tensor Interaction ◽

Contact Term ◽

Baryon Octet ◽

Particle Data Group ◽

S Wave ◽

Wave Approximation ◽

Decay Widths ◽

Data Group

The interaction potentials between vector mesons and baryon octet are calculated explicitly with a summation of t-, s-, and u- channel diagrams and a contact term originating from the tensor interaction. Altogether, 13 resonances are generated dynamically in different channels of strangeness zero by solving the relativistic Lippman-Schwinger equations in the S-wave approximation, and their masses, decay widths, isospins and spins are determined. Some resonances are well fitted with their counterparts listed in the newest review of Particle Data Group (PDG),1 while others might stimulate the experimental observation in these energy regions in the future.

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THERMODYNAMICS OF SCHWARZSCHILD–(ANTI-)DE SITTER BLACK HOLES WITH ACCOUNT OF QUANTUM CORRECTIONS

International Journal of Modern Physics A ◽

10.1142/s0217751x00000483 ◽

2000 ◽

Vol 15 (07) ◽

pp. 989-1010 ◽

Cited By ~ 14

Author(s):

SHIN'ICHI NOJIRI ◽

SERGEI D. ODINTSOV

Keyword(s):

Black Holes ◽

Effective Action ◽

Quantum Correction ◽

Quantum Corrections ◽

De Sitter ◽

S Wave ◽

Wave Approximation ◽

Quantum Matter ◽

Large N ◽

Gravitational Background

We discuss the quantum corrections to thermodynamics (and geometry) of S(A)dS BH's using large N one-loop anomaly induced effective action for dilaton coupled matter (scalars and spinors). It is found that the temperature, mass and entropy with account of quantum effects for multiply horizon SdS BH and SAdS BH which also gives the corresponding expressions for their limits: Schwarzschild and de Sitter spaces. In the last case one can talk about quantum correction to the entropy of an expanding universe. The anomaly induced action under discussion corresponds to 4d formulation (s-wave approximation, 4d quantum matter is a minimal one) as well as 2d formulation (complete effective action, 2d quantum matter is a dilaton coupled one). Hence, most of the results are given for the same gravitational background with interpretation as 4d quantum corrected BH or 2d quantum corrected dilatonic BH. Quantum aspects of thermodynamics of 4d 't Hooft BH model are also considered.

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CAN QUANTUM-CORRECTED BTZ BLACK HOLE ANTI-EVAPORATE?

Modern Physics Letters A ◽

10.1142/s0217732398002862 ◽

1998 ◽

Vol 13 (33) ◽

pp. 2695-2704 ◽

Cited By ~ 19

Author(s):

SHIN'ICHI NOJIRI ◽

SERGEI D. ODINTSOV

Keyword(s):

Black Hole ◽

Effective Action ◽

Quantum Evolution ◽

S Wave ◽

Btz Black Hole ◽

Higher Modes ◽

Wave Approximation ◽

Large N ◽

The One ◽

Kaluza Klein

Kaluza–Klein reduction of 3-D gravity with minimal scalars leads to 2-D dilaton-Maxwell gravity with dilaton coupled scalars. Evaluating the one-loop effective action for dilaton coupled scalars in large-N and s-wave approximation, we apply it to study quantum evolution of BTZ black hole. It is shown that quantum-corrected BTZ BH may evaporate or else anti-evaporate which is similar to 4-D Nariai BH as is observed by Bousso and Hawking. Instable higher modes in the spectrum also indicate the possibility of proliferation of BTZ BH.

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PLANE-WAVE APPROXIMATION FOR THE SCATTERING AMPLITUDE

Canadian Journal of Physics ◽

10.1139/p64-095 ◽

1964 ◽

Vol 42 (6) ◽

pp. 1017-1029 ◽

Cited By ~ 3

Author(s):

H. H. Chan ◽

M. Razavy

Keyword(s):

Plane Wave ◽

Born Approximation ◽

Wave Scattering ◽

Scattering Amplitude ◽

Unitarity Condition ◽

S Wave ◽

Wave Approximation ◽

High Energies ◽

Infinite Sum ◽

Plane Wave Approximation

Different methods of calculating the S-wave scattering amplitude using the plane-wave approximation are discussed. The resulting scattering amplitudes satisfy the unitarity condition and for high energies approach the Born approximation asymptotically. These methods are applied to the special class of potentials that can be expressed as an infinite sum of exponential potentials, and in particular to some potentials for which the exact solutions are known. It is found that imposing the unitarity condition on the Born approximation, in general, does not improve the result of the calculation.

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